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Coronado BF-30 (straight through) type secondary blocking filter. The blocking filter is the second element in any Coronado H-alpha system, it is just as crucial to your safety and the system's performance as the front element. Cannot be used without an SM front cell.
* Secondary interference filter for full disc image of the Sun for telescopes up to 3,000mm focal length, with precision machined 2" barrel diameter. Requires 2" focuser.
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